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Donaldson GP, Ladinsky MS, Yu KB, Sanders JG, Yoo BB, Chou WC, Conner ME, Earl AM, Knight R, Bjorkman PJ, Mazmanian SK. Gut microbiota utilize immunoglobulin A for mucosal colonization. Science 2018; 360:795-800. [PMID: 29724905 DOI: 10.1126/science.aaq0926] [Citation(s) in RCA: 361] [Impact Index Per Article: 60.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Accepted: 03/29/2018] [Indexed: 12/11/2022]
Abstract
The immune system responds vigorously to microbial infection while permitting lifelong colonization by the microbiome. Mechanisms that facilitate the establishment and stability of the gut microbiota remain poorly described. We found that a regulatory system in the prominent human commensal Bacteroides fragilis modulates its surface architecture to invite binding of immunoglobulin A (IgA) in mice. Specific immune recognition facilitated bacterial adherence to cultured intestinal epithelial cells and intimate association with the gut mucosal surface in vivo. The IgA response was required for B. fragilis (and other commensal species) to occupy a defined mucosal niche that mediates stable colonization of the gut through exclusion of exogenous competitors. Therefore, in addition to its role in pathogen clearance, we propose that IgA responses can be co-opted by the microbiome to engender robust host-microbial symbiosis.
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Affiliation(s)
- G P Donaldson
- Department of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA.
| | - M S Ladinsky
- Department of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - K B Yu
- Department of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - J G Sanders
- Department of Pediatrics, University of California, San Diego, CA 92110, USA.,Department of Computer Science and Engineering, University of California, San Diego, CA 92093, USA
| | - B B Yoo
- Department of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - W-C Chou
- Infectious Disease and Microbiome Program, Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - M E Conner
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX 77030, USA
| | - A M Earl
- Infectious Disease and Microbiome Program, Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - R Knight
- Department of Pediatrics, University of California, San Diego, CA 92110, USA.,Department of Computer Science and Engineering, University of California, San Diego, CA 92093, USA
| | - P J Bjorkman
- Department of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - S K Mazmanian
- Department of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA.
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